How old until you give up TOURING

Don`t know how old is to old

Came across an old couple this weekend who live in Harrogate and towed to Bognor ,Chap is 92 and his wife 88 ,wife does the towing but neither can do anything van wise the neighbour hitches the van up and they rely on the kindness of members on site to set them up they are complete with a 16 year old jack russell , The lady has bad curvature of the spine and has to lift her head up with her hand to look forward husband can do very little . So is it time to stop